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If you're looking to charge mobile devices like phones or tablets, I've had great luck with a device I got off of Ebay for about $40.
3" x 4" x 5/8" footprint. About the same size as a Galaxy SIII.
6000mah internal battery.
Solar panels on the top.
Battery level indicator.
You can charge the internal battery by plugging it in or by leaving it in the sun.
Has two USB outs so you can charge several devices at once.
I've had mine for about a year now and taken it on the road, hiking, camping, etc... Zero issues, works great, and doesn't take up a lot of space. When we're at home or driving, I just toss it up in the window.
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